Changjo was born Choi Jonghyun 최종현 on Thursday, November 16, 1995, in Chuncheon-si, Gangwon-do. The age gap between him and Teen Top’s oldest member, C.A.P., is 3 years and 12 days. They’re both Scorpios with birthdays in November.

Like Ricky, he was born in the Chinese Year of the Pig. Changjo and Chunji’s blood type is B. At a height of 179 cm or 5'10½", Changjo is Teen Top’s tallest member. He’s taller than the shortest member, Ricky, by 7 cm.

He and Ricky both studied at Hoseo University and Seoul School of Performing Arts. He also attended Chuncheon Middle School. He has an older sister named Yumi.

Changjo plays the piano. He sang Flo Rida’s “Be on You” and danced to Black Eyed Pea’s “Boom Boom Pow” for his TOP Media audition.

He knows taekwondo and Jeet Kune Do. When he was younger, he dreamed of being a bodyguard, but he thinks that he would get hit before he get a chance to defend himself in a real fight.